Aluminum Plum Flexible Shaft Coupling 25x30mm

The BSCOU-25mm is an aluminum plum flexible shaft coupling designed to connect a driving shaft to a driven shaft while compensating for angular, parallel, and axial misalignment. It has an outer diameter of 25 mm and a length of 30 mm, with bore diameters of 5 mm on one side and 8 mm on the other, making it a common choice for pairing small stepper motors, servo motors, and lead screws in compact motion systems. The two aluminum hubs feature a plum-shaped jaw profile, and a polyurethane flexible element—often called a spider—sits between them to absorb vibration, damp shock loads, and reduce the stress transferred to bearings and shafts.

Because the flexible insert is the only compliant part, the coupling provides zero backlash in the rotational direction, which is important for precision positioning in 3D printers, CNC routers, and automation equipment. The aluminum alloy body keeps the coupling lightweight while offering good corrosion resistance, and the set-screw or clamping hubs allow straightforward installation on the mating shafts. This flexible plum coupling is widely used in robotics, printing and packaging machinery, medical and food equipment, and general industrial drive trains where a compact, low-maintenance connection between two shafts is required.

1. Connecting stepper motors and servo motors to lead screws in 3D printers.
2. CNC routers, engravers, and small milling machines.
3. Robotics and automation equipment with compact drive trains.
4. Printing, packaging, and labeling machinery.
5. Medical, food, and fitness equipment requiring vibration damping.
6. General industrial shaft connections where misalignment compensation is needed.

1. Model: BSCOU-25mm.
2. Type: aluminum plum flexible shaft coupling (jaw coupling).
3. Outer diameter: 25 mm.
4. Length: 30 mm.
5. Bore diameters: 5 mm × 8 mm (d1 × d2).
6. Hub material: aluminum alloy.
7. Flexible element material: polyurethane (spider).
8. Rated torque: 1 N·m (per comparable 25 × 30 mm plum couplings).
9. Maximum speed: 20,000 RPM (per comparable 25 mm plum couplings).
10. Torsional characteristics: zero backlash.
11. Misalignment compensation: angular, parallel, and axial.
12. Working temperature range: -40°C to +100°C (per aviation aluminum alloy plum coupling data).
13. Fastening: set screw or clamping hub (per source description).